Improvement in sectional steam-generators



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Patented Sept. 28,1875.

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T. T A R P M u R E K A W W nm WtfrEsEESQ NITED *STATES PATENT i EErcEf GEORGE w. wALxERoE MELDEN, AND MILEs PRATT, oF

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IMPROVEMENT IN SECTIONAL STEAM-GENERATQRS.

Specication forming part of Letters Patent No. 16S, 19S, dated September 28, 1875; application filed August 14, 1875.

\ To all whom it'inay concern:

Beit known that we, GEORGE W. WALKER,

of Malden, and MILES PRATT, of Watertown,

both in the county of Middlesex and State of lowing is a speciication Thls lnventlon relates to steam-generators specially designed for heating purposes, but

applicable to otherpurposes.

The invention has for its object the production of a generator in whichl the water from which steam is produced shall circulate freely from section to section throughout the entire extent of the generator, thereby equalizing the temperature of the water in the several sections.

In generators for heating purposes, as now made, the sections containing water are connected at bottom to keep the water in each section on a level, and the sections are also connected at top above the water-line and opposite the steam-spaces, and with such a connection the steam rising from the water in the sections nearest the fire-chamber is condensed by coming in contact with the colder water and plates of the sections most remote from the fire-chamber, and the result is that the sections in excess of six or eight sections are not properly heated, and-tend to lessen the production of steam. l

Our invention consists Ain a generator of two or more connected sections, provided with inlet-pipes or water-receiving ways or passages at their lower parts, and with connectingplpes or watercirculating ways above the inlet-passages, and connected with the sections below the steam-chamber and water-level, whereby the hottest water in the sections nearest the fire-chamber is allowed Vto circulate freely into the more remote sections.

Figure l represents our improved generator in perspective, and Fig. 2 is a horizontal sec! tion thereof.

We have not considered it necessary to show the lire-chamber for containing the coal or other fuel to heat the generator, for any well-known arrangement of fire-chamber will or may be used, and the generator will be incased in any well-known way. lt is assumed that a fire-chamber of suitable construction is placed atthe left of Fig. 1, and the products of combustion proceeding' therefrom pass into .the fine-spaces between the tubes of the iirst vand adjacent sections, and, passing through the last section, return from the upper flue-- spaces in the first section, as indicated by the arrows, and then to a suitable smoke-pipe.

:of metallic hollow plates a a, fitted face to face. Each section is cast as shown', to form tubes band nue-spaces c above and below a flanged portion, d, of the sections, which, by being fitted together, or nearly so, form between the tubes an extended flue-space sufcient to guide the products of combustion through the lower flue-spaces of all the sections, and then permit such products to return backward through the upper flue-spaces.

By making the tubes 'b wedge-shaped instead of circular or square, We are enabledto increase the surface of the tubes exposed to the action of the productsv of combustion, to give the greatest amount of heated surface to act on the water, and the entire surface of the tubes may b e Aeasily reached by a flue-V brush to clean the tubes from soot or ashes, and at the same time the area of the lluespace is increased to an extent greater than if the tubes were'circul'ar and of a diameter equal to the largest diameter of the wedgeshaped tubes Z.

The water to be converted into steam is led from a suitable supplying source into the inlet-pipe e, connected with the lower part of each section A, and the water is kept on a level about with the flange f, the upper portion of each section, as at g, above the waterlevel, being used as a steam-space, and the steam generated in these several sections rises in the steam space or chamber g, and thence passes into the steam-pipe h, from which it is led to the point where it is to be used.

The connecting or water-circulating pipe i connects with each section A below the waterlevel, and preferably between the two flanges df, or at about the center of the height of the sections. The water in the sections circulates freely from section to section through this connecting-pipe i, the hottest water rising wATERTowN,

The sections A are composed, preferably,

and Jflowing from the section next the rechamber backward to the most remote section, and the cooler water passes through the pipe e forward into other sections nearer the lire-chamber, and in this way the circulation of the water is kept constant, equalizing its temperature, enabling the production of lnore steam. The pipe j permits the escape of air from the circulating-pipe into the steam-pipe h when lling the generator with Water, and it also serves to conduct water of condensation from the lower part of the steam-pipe back into the water-pipe or the sections. Instead of this pipe, we might use valves, which would be opened and closed as desired.

rIhe generator may be used as a steamboiler to generate steam for power.

Any number ot' sections may be used, they being suitably connected together.

Instead of the connecting-pipes e i, (shown in the drawings,) the sides of the sections at bottom, and at or near the center of the sections, but below the water-levelv in the sections, may be provided with flanged openings, which may be brought togetherx-to form the water-passages, the sections being suitably joined or fastened together.

We do not desire to limit this invention to a generator having two Hue-spaces, one being a return flue-space, for the products of combustion might pass but once between the tubes and not return.

The narrow ends of the wed ge-shaped tubes, instead of being separated, as shown in the drawings, may be brought-together, or substantially so.

We claim- 1. The combination, with two or more sections of a steam-generator with tubes, of au inlet-pipe or water-receivin g Way and a watercirculating or connecting pipe or way, con- -pipe connecting the steam-spaces of the sections, all substantially as described. v

In testimony whereof we have signed our names to this specification in presence of two subscribing witnesses.

GEO. W. WALKER. MILES PRATT.

Witnesses G. W. GREGORY, S. B. KLDDER. 

